To which of the following salts, sodium hydroxide when added gives a precipitate?

Zinc chloride

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Zinc nitrate

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Zinc sulphate

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All of the above

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Solution

The correct option is D
All of the above

All of these salts, when treated with sodium hydroxide, produce a gelatinous white precipitate of zinc hydroxide, $Z n (O H)_{2}$ (gelatinous white ppt)

$Z n S O_{4} + 2 N a O H \to N a_{2} S O_{4} + Z n (O H)_{2}$
$Z n C l_{2} + 2 N a O H \to 2 N a C l + Z n (O H)_{2}$
$Z n (N O_{3})_{2} + 2 N a O H \to 2 N a N O_{3} + Z n (O H)_{2}$

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